Adding-machine.



PATENTBD APR. 4, 1905.

H. EBBRHA RDT.

ADDING MACHINE.

.APPLIOATION FILED MAR. s, 1904.

2 SHEETS-SHEET 1.

IIIIII 'IIIIIA'IIIIIIIIIIIIII/l No. 786,490. PATENTED APR. 4., 1905. H. BBERHARDT. ADDING MACHINE.

APPLIUATION FILED MR.3, 190g.

2 SHEETS-SHEET 2.

Patented April 4, 1905.

UNITED STATES PATENT OEEICE.

HERMANN EBERHARDT, OF BRESLAU, GERll/IANY.

ADDING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 786,490, dated April 4, 1905.

Application filed March 3, 1904. Serial No. 196,284.

To all who/1t it 'mf/Ly/ l10n/cern:

Beitknown that l, HERMANN EBERHARDT, a subject of the Emperor of Germany, and a resident of Breslau, Germany, have invented certain new and useful Improvements in Adding-Machines; and l do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The subject of my invention is an addingmachine in which the addition is done in items instead of in columns and the separate items on addition appear printed in order on a paper strip, so that any error in the calculation can be' immediately determined by comparison with the numbers presented and corrected without further addition. The individual numerals of the items can beset up for addition in the same order as they are spoken-that is to say, from left to rightwhereby correctness of addition is essentially promoted.

ln the accompanying drawings, Figure l shows an interior elevation, partly in section, of the apparatus in the position of rest.-

Fig. 2 represents a horizontal section on the line A A of Fig. l. Fig. 3 is a diagrammatic view of the apparatus in the position for use.

The apparatus is contained in a case l), supported on legs a, and comprises the counting-wheels c c2 c3, the carrying-wheels d d 2 (Z3, and the driving-segments e e2 c". Instead of there being only three of each of the said parts, as shown, any desired number of the same may be employed. The countingwheels c adjoin each other and are acted upon by a spring f, having a tendency to press them to the left, and their teeth are provided with the numerals from 0 to 9, as is usual in such machines. They are mounted with capability of sliding on the shaft g, while the carrying-wheels d, which are free to rotate on shaft h, but are rigidly secured against sliding thereon, and the segments c, having sector-shaped apertures i, are mounted to rotate on the shaft lr and slide horizontally and transversely thereon. Owing to the lateral sliding motion of the countingwheelsc, on the one hand, and the twofold motion of the segments, on the other hand, one or more counting-wheels may be forced out of engagement with the carrying-wheels. This is effected by means of the beveled edges m of the segments c2 c, If one of these segments-for instance, the segment @his drawn forward out of the position of rest, Fig. l, until the rear wall of the aperture i reaches the shaft r, the counting-wheel c will be moved to the right against the action of springf by the beveled edge m2, and thus the pin n2 is removed out of the plane of the carrying-wheel d 2, so that on turning the segment c2, the teeth of which at this same time engage in those of the wheel c2, the wheel c2, but not the wheel c, will be set in motion. lf the segment e2 is thrown back again out of gear with the wheel c, this wheel under the influence of the spring j' will return to its position of rest. lf the segment e3 is then moved forward in the same manner as previously was the segment c2, it will not only force the wheel c aside, but also the wheel c2, and consequently not only the pin a2, but also the pin n", will be thrown out the plane of their engagii 1g carrying-wheels, the wheel c3 alone being thus set in motion when the segment is operated. Thus when. any segment is actuated all the counting-wheels to the right of it are disengaged from the carrying-wheels.

From this it is clear that when each segment is operated none of the succeeding countingwheels to the right will be actuated, while the one it engages and the carrying-wheel will be in front of it, and all of the wheels to the left will be in operative position. From this results the advantage already mentioned that the numerals of the individual items can be arranged for addition and printed in the order in which they are spoken-that is to say, from left to right.

For the adding operation the sector-shaped frames o, rigidly secured to the segments e, are employed, the front of said frames being thickened, and a handle 1 is provided for each frame capable of sliding outwardly from the center of motion of the segment and each furnished with numerals from 0 to 9 and provided below with type p. The outward movement of the handles r is lim- IOO ited by the shoulder r', provided on each stem. lf now one of those handles is seized and drawn forward, its segment will be drawn forward and will engage with the corresponding counting-wheel, and at the same time the handle also will advance outwardly, so that on the segment-frame moving downward under pressure on the handle the countingwheels are set in motion until the projecting handle strikes the paper roll or strip t, located in a table s in front of the machine, and thus the type p of that particular handle prints upon the paper. As the longer or shorter rotation of the wheels depends upon the stroke of the frame e each time and as the position, as well as the number of the handles r, corresponds with the teeth of the wheels and as the moving wheels at each rotation on their axis advance the succeeding wheel one tooth, it is obvious that by pulling forward and depressing the various handles in succession the wheels c give the sum of the figures marked on the paper if, which numbers can be read on the teeth of the counting-wheels through the slot a, Fig. l, provided in the casing. lt is obvious that the handle carrying the numeral O has to be arranged so far below that its downward movement for the purpose of printing the O upon the paper strip is so slight that it will not advance the counting-wheel. In order to secure the frames o in their position of rest and to guide them on their downward and upward oscillations, like-shaped fixed segments e are secured on the casing closely adjacent to the frames 0, and in these segments are cut two circular grooves w and x, eccentric to each other and connected b y short horizontal grooves. At the upper end of the groove is a recess 2,', in which engages a pin 2, secured to the frame o, whereby the position of rest of the 'frame o is secured. When for the purpose of effecting the engagement of a segment e with a countingwheel a frame o is drawn forward, its pin Z passes through the top cross-groove into the external circular groove te and upon the descent of the frame slides in said external groove until stopped by the stopping of the segment in consequence of the type on the handle now in use contacting with the paper, thereby guiding the movement. The crossgrooves are so disposed that the pin e on the protruding type striking the paper strip always comes opposite one ofsaid cross-grooves, from which position the frame can be pushed back, passing the pin through a cross-groove into the inner groove x, whereby the segment is disengaged from its counting-wheel, and the frame is then moved upward into the position of rest, the pin e being during this latter movement guided in the inner groove Having thus described my invention, I claim as newl. In an adding-machine, the combination of a shaft, spring-actuated counting-wheels mounted thereon with capability of sliding sidewise, a parallel shaft and carrying-wheels loosely mounted thereon and gearing with the counting-wheels, and toothed driving means engaging the counting-wheels, and adapted to slide any desired number of them on their shaft so as to separate them from the remaining counting-wheels, substantially as described.

2. In an adding-machine, the combination of a shaft, spring-actuated counting-wheels mounted thereon with capability of sliding sidewise, a parallel shaft and carrying-wheels loosely mounted thereon and gearing with the counting-wheels, a shaft located parallel to the said shafts, and toothed segments gearing with the counting-wheels, mounted thereon, and each having a sector-shaped aperture for the shaft, and with the exception of the extreme right-hand segment, provided with a conical surface which in the advanced position of the segment slides the countingwheels which lie to the right of it on their shaft, substantially as described.

8. In an adding-machine, the combination of a shaft, spring-actuated counting-wheels mounted thereon with capability of sliding sidewise, a parallel shaft and carrying-wheels loosely mounted thereon and gearing with the counting-wheels, a shaft located parallel to the said shafts, and toothed segments gearing with the counting-wheels, mounted thereon, and each having a sector-shaped aperture for the shaft, and with the exception of the extreme right-hand segment, provided with a conical surface, which in the advanced position of the segment slides the countingwheels which lie to the right of it on their shaft, sector-shaped frames rigidly secured to the segments, draw r-out type-bearing handles secured to the front of the frames, and a printing-surface below the handles, receiving the impression of the type on depression of the said handles, substantially as described.

4. In an adding-1n achine, the combination of a shaft, spring-actuated counting-wheels mounted thereon with capability of sliding sidewise, a parallel shaft and carrying-wheels loosely mounted' thereon and gearing with the counting-wheels, a shaft located parallel to the said shafts, and toothed segments gearing with the counting-wheels, mounted thereon, and each having a sector-shaped aperture for the shaft, and with the exception of the extreme right-hand segment, provided with a conical surface, which in the advanced position of the segment slides the countingwheels which lie to the right of it on their shaft, sector-shaped frames rigidly secured to the segments, draw-out type-bearing handles secured to the front of the frames, and a printing-surface below the handles, receiving the impression of the type on depression of the said handles, a pin secured to the top of IOO IlO

IZO

In testimony that l claim the 'foregoing as my lnventlon I have signed my name 1n pres- 1o en'ce of two subscribing Witnesses.

HERMANN EBERHARDT.

l/Vtnesses ERNST KATZ, ALBERT SOHENK. 

